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Rock Pi 4 A/B Single Board Computer {#_rockpi}

ROCK Pi 4 is a Rockchip RK3399 based SBC(Single Board Computer) by Radxa. It can run android or some Linux distributions. ROCK Pi 4 features a six core ARM processor, 64bit dual channel 3200Mb/s LPDDR4, up to 4K@60 HDMI, MIPI DSI, MIPI CSI, 3.5mm jack with mic, 802.11 ac WIFI, Bluetooth 5.0, USB Port, GbE LAN, 40-pin color expansion header, RTC. Also, ROCK Pi 4 supports USB PD and QC powering.

ROCK Pi 4 comes in two models, Model A and Model B, each model has 1GB, 2GB or 4GB ram options. for detailed difference of Model A and Model B, please check Specifications.

Board Support

Interface notes

  • UART: ttyS0 not usable, use ttyS2 and ttyS4
  • UART2 is enabled as U-boot and Linux serial console by default. Check Rockpi4/dev/serial-console to use. Check Rockpi4/hardware/devtree_overlays to disable serial console on UART2.
  • UART2 & UART4 support a wide range of baud rate. It includes but not is not limited to the following baud rates. For instance, 115200bps. 500000bps, 1500000bps and so on.
  • Function marked with color orange is the default function of this pin.
  • Except Pins for power supply, all pins are laid out directly to Soc RK3399.
  • For pin 3, 5, 27, 28, 29 and 31, each pin is connected to the 3.0V supply through a 4.7K pull-up resistor.
  • Pin 19, 21, 23, 24 are laid out directly to the pins of SPI device on board.
  • Pin 7 is laid out directly to the pin of MIPI CSI on board.
  • For I2C-2 and I2C-7
  • We have do the test using the i2c device e2prom. We need to open the i2c device file, and then do the read or write operation.

Pin Mapping

PROCK Pi 4 has a 40-pin expansion header. Each pin is distinguished by color.

Additional Function Primary Function PIN PIN Primary Function Additional Function
+3.3V 1 2 +5.0V
I2C7_SDA 3 4 +5.0V
I2C7_SCL 5 6 GND
SPI2_CLK 7 8 UART2_TXD
GND 9 10 UART2_RXD
PWM0 11 12 I2S1_SCLK
PWM1 13 14 GND
SPDIF_TX 15 16 GPIO4_D2
+3.3V 17 18 GPIO4_D4
UART4_TXD SPI1_TXD 19 20 GND
UART4_RXD SPI1_RXD 21 22 GPIO4_D5
SPI1_CLK 23 24 SPI1_CSn
GND 25 26 ADC_IN0
I2C2_SDA 27 28 I2C2_CLK
I2C6_SCL SPI2_TXD 29 30 GND
I2C6_SDA SPI2_RXD 31 32 SPDIF_TX UART3_CTSn
SPI2_CSn 33 34 GND
I2S1_LRCK_TX 35 36 I2S1_LRCK_RX
GPIO4_D6 37 38 I2S1_SDI
GND 39 40 I2S1_SDO

Resources

The following links will take you to additional Rock Pi 4 resources

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